Aldehydes in hydrothermal solution: Standard partial molal thermodynamic properties and relative stabilities at high temperatures and pressures

Journal Article · Sun Aug 01 04:00:00 EDT 1993 · Geochimica et Cosmochimica Acta; (United States)

DOI:https://doi.org/10.1016/0016-7037(93)90337-V· OSTI ID:5577092

Schulte, M D; Shock, E L ^[1]

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1. Washington Univ., St. Louis, MO (United States)

Aldehydes are common in a variety of geologic environments and are derived from a number of sources, both natural and anthropogenic. Experimental data for aqueous aldehydes were taken from the literature and used, along with parameters for the revised Helgeson-Kirkham-Flowers (HKF) equations of state, to estimate standard partial molal thermodynamic data for aqueous straight-chain alkyl aldehydes at high temperatures and pressures. Examples of calculations involving aldehydes in geological environments are given, and the stability of aldehydes relative to carboxylic acids is evaluated. These calculations indicate that aldehydes may be intermediates in the formation of carboxylic acids from hydrocarbons in sedimentary basins brines and hydrothermal systems like they are in the atmosphere. The data and parameters summarized here allow evaluation of the role of aldehydes in the formation of prebiotic precursors, such as amino acids and hydroxy acids on the early Earth and in carbonaceous chondrite parent bodies. 97 refs., 5 figs., 3 tabs.

• OSTI ID: 5577092
• Journal Information: Geochimica et Cosmochimica Acta; (United States), Journal Name: Geochimica et Cosmochimica Acta; (United States) Vol. 57:16; ISSN GCACAK; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACETALDEHYDE
ALDEHYDES
AMINO ACIDS
BRINES
CARBOXYLIC ACIDS
ENERGY SYSTEMS
EQUATIONS
EQUATIONS OF STATE
FORMALDEHYDE
GEOLOGIC STRUCTURES
GEOTHERMAL SYSTEMS
HIGH PRESSURE
HYDROCARBONS
HYDROTHERMAL SYSTEMS
HYDROXY ACIDS
MATHEMATICAL MODELS
ORGANIC ACIDS
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
SEDIMENTARY BASINS
SYNTHESIS
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
THERMODYNAMIC PROPERTIES